diff --git a/README-jp.md b/README-jp.md
index a113975..598ba8e 100644
--- a/README-jp.md
+++ b/README-jp.md
@@ -869,6 +869,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [The bug bounty program that changed my life](http://10degres.net/the-bug-bounty-program-that-changed-my-life/) - Written by [Gwen](http://10degres.net/).
 - [List of bug bounty writeups](https://pentester.land/list-of-bug-bounty-writeups.html) - Written by [Mariem](https://pentester.land/).
 - [Implications of Loading .NET Assemblies](https://threatvector.cylance.com/en_us/home/implications-of-loading-net-assemblies.html) - Written by [Brian Wallace](https://threatvector.cylance.com/en_us/contributors/brian-wallace.html).
+- [WCTF2019: Gyotaku The Flag](https://westerns.tokyo/wctf2019-gtf/wctf2019-gtf-slides.pdf) - Written by [@t0nk42](https://twitter.com/t0nk42).
 
 ## Code of Conduct
 
diff --git a/README-zh.md b/README-zh.md
index 95a7e54..38d7556 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -922,6 +922,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [The bug bounty program that changed my life](http://10degres.net/the-bug-bounty-program-that-changed-my-life/) - Written by [Gwen](http://10degres.net/).
 - [List of bug bounty writeups](https://pentester.land/list-of-bug-bounty-writeups.html) - Written by [Mariem](https://pentester.land/).
 - [Implications of Loading .NET Assemblies](https://threatvector.cylance.com/en_us/home/implications-of-loading-net-assemblies.html) - Written by [Brian Wallace](https://threatvector.cylance.com/en_us/contributors/brian-wallace.html).
+- [WCTF2019: Gyotaku The Flag](https://westerns.tokyo/wctf2019-gtf/wctf2019-gtf-slides.pdf) - Written by [@t0nk42](https://twitter.com/t0nk42).
 
 ## Code of Conduct
 
diff --git a/README.md b/README.md
index f9cf2df..a95c73b 100644
--- a/README.md
+++ b/README.md
@@ -864,6 +864,7 @@ If you enjoy this awesome list and would like to support it, check out my [Patre
 - [The bug bounty program that changed my life](http://10degres.net/the-bug-bounty-program-that-changed-my-life/) - Written by [Gwen](http://10degres.net/).
 - [List of bug bounty writeups](https://pentester.land/list-of-bug-bounty-writeups.html) - Written by [Mariem](https://pentester.land/).
 - [Implications of Loading .NET Assemblies](https://threatvector.cylance.com/en_us/home/implications-of-loading-net-assemblies.html) - Written by [Brian Wallace](https://threatvector.cylance.com/en_us/contributors/brian-wallace.html).
+- [WCTF2019: Gyotaku The Flag](https://westerns.tokyo/wctf2019-gtf/wctf2019-gtf-slides.pdf) - Written by [@t0nk42](https://twitter.com/t0nk42).
 
 ## Code of Conduct